Effondrement de cavités souterraines et interactions sol-structure : développement d’un modèle expérimental

Abstract : Subsidences of great amplitude result from the collapse of underground cavities resulting from human industrial activity (mines) or formed naturally by water in soluble solid rock masses (limestone, gypsum). Their impact on existing buildings on the surface is generally of great importance, as attested by recent examples: Auboué (1996), Moutiers (1997) and Roncourt (1999) causing damage to more than five hundred buildings. Another example is the sinkhole on the METEOR site (Paris) in 2003. It is thus necessary to consider ground movements at the surface (settlements and horizontal deformations) resulting from these phenomena and especially to determine the influence of the presence of superficial structures on the form and the amplitude of these movements. The research programme is based on the evaluation of urban risks due to ground movements caused by underground cavities and soil-structure interactions. It is focused on the design of a small-scale two-dimensional physical model that enables a sinkhole-like cavity collapse to be represented. This work is an innovative contribution to the design of 1g small-scale physical model through the development of cohesive analogical material, derived from Schneebeli material. Tests are then carried out in order to determine the influence of soil-structure interactions associated with a sinkhole. The following steps are finally presented by means of parametric studies on the position of the building, the geometry of the cavity, etc., and a new 3D physical model enabling such phenomena to be investigated in much more depth is introduced.
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Matthieu Caudron. Effondrement de cavités souterraines et interactions sol-structure : développement d’un modèle expérimental. Rapport Scientifique INERIS, 2007, 2006-2007, pp.79-81. ⟨ineris-01869096⟩

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